SECRET has received much love in the past with songs such as "Magic," "Madonna," "Shy Boy," "Starlight Moonlight," and "Love is Move." SECRET is making a comeback in Korea after almost a year since "Love is Move."

SECRET released each member's jacket image and teaser video before the release of the album to show the change of the group from a little sister to a real woman.

Kang Jiwon and Kim Kibum, the composers who has worked on SECRET's previous hit songs wrote "Poison," and they stressed importance on having the saxophone instrumentation with hip-hop groove. The song is about how you know that more you get in to loving someone, it is going to poisonous.

Director Hong Wongi who worked with best artists such as Girls' Generation, BEAST, and Seo Teji worked on the music video of "Poison" with SECRET for the first time. The music video is set in 1940s England and it will show each member's acting skills.

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After news that Jinwoon and Seulong had followed in Changmin's footsteps and left JYP Entertainment leaving only Jo Kwon behind, all four members of the K-pop ballad group left messages to their concerned fans on their official fancafe.